Forum: Ruby Crontabbing a Ruby script inside a screen

Hi, I run this Ruby + Sequel script inside a screen that records data 
from
this live stream 24/7. But it tends to core dump every once in a while, 
and
since I run it in a screen (so it's easy to check in on), I can't really
scroll up to catch the error whenever it happens.

So how do I crontab the screen with the Ruby script inside it? Has to be
with a "don't run it if it's already running" check to avoid fatal
consequences. So far I have:

$ crontab -e

*/10 * * * * lockf -t 0 /home/anonymous/.myscript.rb.lock
/usr/local/bin/screen -d -m -S myscript
/home/anonymous/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
/home/anonymous/myscript.rb

Thank you!

--Dwayne

On Thu, Jan 24, 2013 at 12:32 PM, Dwayne Henderson
<its.code.in.here@gmail.com> wrote:
>
> */10 * * * * lockf -t 0 /home/anonymous/.myscript.rb.lock
> /usr/local/bin/screen -d -m -S myscript
> /home/anonymous/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
> /home/anonymous/myscript.rb

I am not 100% sure what you want to achieve.  But it seems to me that
it would be easier to wrap your Ruby script in something else that
restarts the script if it crashes.  Like

#!/usr/bin/dash

# no cores
ulimit -c 0

while :; do
  /home/anonymous/.rvm/rubies/ruby-1.9.3-p0/bin/ruby 
/home/anonymous/myscript.rb
done

And have screen start this script.

Kind regards

robert

On Thu, Jan 24, 2013 at 1:33 PM, Robert Klemme
<shortcutter@googlemail.com>wrote:

> while :; do
>   /home/anonymous/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
> /home/anonymous/myscript.rb
> done
>
> And have screen start this script.
>

My God, Robert, this is brilliant :D

Thanks a bunch man. Nice blog too!

--Dwayne